Many have heard it, but nobody has ever seen it. It will not speak back until spoken to. What is it?, echo, What is black when you buy it, red when you use it and gray when you throw it away?, charcoal, I am a god, a planet and I can measure heat. What am I?, mercury, You stick your poles inside me. You tie me down to get me up. I get wet before you do. What am I?, tent

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